B.—CHEMTSTRY. 



39 



Green's formula 'M- 



CHOH 



-CH- 







CHOH- 



-CH- 



-CH2 



>0 

 -CHOH 



would give a trimethyl cellulose whicli on hydrolysis would lose one 

 methyl group and be converted into 3,4-dimethyl glucose of the amylene- 

 oxide type. 



Vignon's formula '- : — 



CHOH CH 



CHo 



\ 



0, 



o 



XI. 



CHOH CHOH- CH 



is equally unsatisfactory in that the final product should then be 

 2,3,4-trimethyl glucose of the amylene-oxide type. 



The formulse proposed by Tollens,'^ Cross and Bevan,'' Bartelemy,'^ 

 and Pictet "' may be deleted for similar reasons. It is also possible to 

 dispose of Karrer's^' formula, which is that of an anhydro-cellobiose 

 (termed ' cellosan '). 



-CH- 







CHOH 



O 



XIL 



CH • CHOH • CHOH . CH ■ CHOH • CHo 



I 



-0 



CHOH 



Jh 



I 

 CH 



I 

 CHoOK 



A compound possessing this stiuctuio would yield, on methylation and 

 hydrolysis, 



1 molecule of ■2,3,5-trimethyl glucose 



and 1 molecule of 2,3,6-trimethyI glucose. 

 Our experimental evidence is completely opposed to this view. 



An entirely different type of cellulose formula may now be 

 tested. Hess proposes '* a glucosidic structure which bears a general 

 resemblance to Fischer's constitution for tannins. Space does not 



